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A box of chalk and 2 staplers cost $10. Three boxes of chalk and 2 staplers cost $18. Find the total cost of 1 box of chalk and 1 stapler.

  • math -

    staples = s
    chalk = c

    c + 2s = 10
    3c + 2s = 18

    -c-2s = -10
    3c + 2s = 18

    2c = 8

    c = 4
    s = 3

    c + s

    4 + 3 = 7
    The total cost $7.

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